EP1189709A1 - Verfahren und vorrichtung zum sortieren von produkten - Google Patents

Verfahren und vorrichtung zum sortieren von produkten

Info

Publication number
EP1189709A1
EP1189709A1 EP00940074A EP00940074A EP1189709A1 EP 1189709 A1 EP1189709 A1 EP 1189709A1 EP 00940074 A EP00940074 A EP 00940074A EP 00940074 A EP00940074 A EP 00940074A EP 1189709 A1 EP1189709 A1 EP 1189709A1
Authority
EP
European Patent Office
Prior art keywords
products
light
product stream
selection
width
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP00940074A
Other languages
English (en)
French (fr)
Other versions
EP1189709B1 (de
Inventor
Johan Calcoen
Jan Cuypers
Nathalie Debaes
Carlo Janssens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Barco Elbicon NV
Original Assignee
Barco Elbicon NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Barco Elbicon NV filed Critical Barco Elbicon NV
Publication of EP1189709A1 publication Critical patent/EP1189709A1/de
Application granted granted Critical
Publication of EP1189709B1 publication Critical patent/EP1189709B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
    • B07C5/3425—Sorting according to other particular properties according to optical properties, e.g. colour of granular material, e.g. ore particles, grain
    • B07C5/3427—Sorting according to other particular properties according to optical properties, e.g. colour of granular material, e.g. ore particles, grain by changing or intensifying the optical properties prior to scanning, e.g. by inducing fluorescence under UV or x-radiation, subjecting the material to a chemical reaction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S209/00—Classifying, separating, and assorting solids
    • Y10S209/939—Video scanning

Definitions

  • the present invention concerns a method and a device for sorting products.
  • it aims a method and a device which is very suitable to be applied in the food industry, for example for sorting out non-food products from certain foods, in particular leaves, branches and pieces of waste such as wood, plastic, stones, etc.
  • the products to be sorted can also be foods of different quality, whereby a quality selection is made by means of the sorting.
  • the method can also be used to separate good and bad products .
  • the described method makes it possible to shine light through the seeds one after the other, but it does not offer a practical embodiment for the treatment of large amounts at once. Moreover, the described method only leads to a selection among seeds, but it does not go in the direction of selecting strange products from foodstuff or such.
  • a method for sorting particles is known from the patent application GB 2.292.455, whereby the particles to be sorted are irradiated with a laser and the obtained "Raman scattering' is used as a sorting criterion.
  • normal Raman scattering is disadvantageous in that the signal obtained by means of "scattering 1 is disturbed too much by the "emission' obtained by means of fluorescence, and thus becomes difficult to detect. That is why it is suggested in GB 2.292.455 to make use of a stimulated Raman signal.
  • this technique is in turn disadvantageous in that a high energy supply is necessary, requiring expensive equipment.
  • the invention aims a method and a device which make it possible to carry out a very efficient and reliable selection in a large product stream, such that the sorting can be applied at an industrial level for the treatment of large quantities of products .
  • the invention in the first place concerns a method for sorting products, characterised in that it at least consists in conveying the products to be sorted in the shape of a product stream, extending in the width, over a specific path; in scanning the products to be sorted over the width of said product stream, by casting light onto the products on the one hand, at least in a specific spectrum which is selected such that certain products of the products to be selected will emit light, and by observing this light in a specific range of the spectrum in which the emitted light is cast on the other hand; in making a selection between the scanned products as a function of the observed light; and in automatically separating the products from the above-mentioned product stream as a function of said selection.
  • the selection is preferably made on the basis of a certain intensity value of the emitted light or of a signal corresponding to it being either exceeded or just not exceeded.
  • a certain intensity value of the emitted light or of a signal corresponding to it being either exceeded or just not exceeded.
  • the emission in a specific spectrum, there is a very clear distinction between signals which are related to a light-emitting product and signal which are related to a non-light-emitting product, which makes it possible to make a very efficient distinction by simply verifying whether the signals either or not exceed a certain value .
  • the light is preferably cast from such a part of the spectrum that light is emitted by the products concerned in another part of the spectrum. This makes it easy to make a distinction between the emitted light and possibly directly reflected light by means of an optical band-pass filter or such.
  • the method will be used for sorting chlorophyll-containing foods, in particular for the selection of strange products from foods.
  • the invention is particularly useful for separating waste from for example peas, especially for separating strange products therefrom such as stones, pieces of wood, plastic and such.
  • the method is applied for separating waste from products containing chlorophyll, such as for example peas
  • light is preferably emitted during the scanning having a wavelength in the order of magnitude of 640 to 680 nanometer, whereas other light is preferably excluded.
  • This wavelength selection can also be used for other foods containing chlorophyll, such as beans, lettuce, sprouts, etc.
  • observations are preferably exclusively made in the wavelength range of 690 to 740 nanometer, preferably by means of optical filtering, and in particular in a range which has a value in the order of magnitude of some 715 nanometer. In this range, the emission can be optimally observed.
  • a practical application thereof according to the invention consists in sorting foods which are affected by fungi from non-affected foods, in particular in sorting nuts or figs which are affected by aflatoxins .
  • the observed emitted light will then be green.
  • measurements will only be carried out in the wavelength range of 440 to 550 nm in this case.
  • a background which will emit light when it is being illuminated, in particular which will fluoresce, such that the light being cast will also produce an emission effect in those places where it is not cast on a product.
  • Use is preferably made here of an emitting background of a surface extending in the width of the product stream which is spherical on the side where the light is cast upon.
  • the spherical shape promotes a very precise emission.
  • the above-mentioned background will consist of a cylindrical roller.
  • a background which emits light after light has thus been cast upon it use can also be made of a background which constantly emits light, preferably of a wavelength which is ideal in relation to the selection to be made.
  • a background is preferably provided which emits light having a wavelength of the same order of magnitude as the light which is emitted by the products to be treated.
  • the scanning according to the invention is preferably carried out by means of a laser, in particular by making a laser beam move diagonally over the product stream in a systematic manner.
  • a scanning system with a moving mirror preferably a rotating polygon mirror or another optical element is used, and the emitted light is returned via the same mirror or the same optical element .
  • the scanning can also take place in another way, for example by means of a fixed light band or a series of light points, directed onto the products which pass by over the width of the product stream, whereby at least the emitted light is observed by means of a camera, and whereby the selection is made on the basis of the evaluation of camera images.
  • a practical technique consists in bringing the products in a single plane on the place where they are to be scanned, via a table, belt or such, either or not provided with longitudinal ducts or grooves .
  • the products preferably fall down freely and the products to be separated are moved apart by means of nozzles which are erected over the width of the product stream and which are individually activated as a function of the observations made, whereby for example the products to be removed from the global product stream are blown away and are collected in a recipient .
  • the products to be sorted can be scanned from two sides, situated opposite to the product stream. This makes it possible to make a right selection with more certainty, which is particularly important when there is a possibility that products show different qualities on the front and on the back side.
  • the method of the invention can possibly be combined with another scanning process, for example with a colour sorting by means of the reflected light.
  • different laser beams can be used, namely at least one laser beam to realise the above- mentioned emission in a different spectrum, and at least one laser beam for sorting for example on the basis of the normal light reflection.
  • the different laser beams can then be simultaneously guided along the same light path according to the invention, possibly slightly shifted in relation to one another. As a result, only one polygon mirror or another optical element will be required to move the laser beams over the product stream.
  • the invention also concerns a device for sorting products according to the method, characterised in that it at least consists of the combination of means for conveying the products to be sorted in the shape of a product stream extending in the width over a certain path; means for scanning the products to be sorted over the width of said product stream, consisting of means to cast light on the products on the one hand, at least in a specific spectrum which is selected such that specific products to be sorted will emit light, and of means to observe this light in a specific range of the spectrum in which the cast light is emitted, on the other hand; means to make a selection between the scanned products as a function of the observed light; and means to automatically separate the products from the above- mentioned product stream as a function of said selection.
  • figure 1 schematically illustrates the method according to the invention
  • figure 2 represents an example of a signal which is obtained during the scanning of the products concerned
  • figure 3 represents a device according to the invention in perspective
  • figure 4 schematically represents the device of figure
  • figure 5 represents a section according to line V-V in figure 4; figure 6 schematically represents a section according to line VI-VI in figure 5 ; figure 7 schematically represents a variant of a device according to the invention.
  • Figure 1 schematically represents how the products 1-2 to be sorted are conveyed over a certain path 3 in the shape of a product stream 4 which extends in the width, in particular a certain width B.
  • the products 1-2 are hereby schematically represented as good products 1, for example peas or other products containing chlorophyll, and the products 2 to be removed, for example strange elements such as stones, pieces of wood and plastic.
  • the product stream 4 is scanned by casting light 6 on the products 1-2 with the help of appropriate means 5 on the one hand, at least in a specific spectrum which is selected such that specific products to be sorted, in this case the products 1, emit light 7, whereas the other products 2 don't, and by observing the light 7 with the help of appropriate means 8 in a specific range of the spectrum in which the emitted light 7 is emitted on the other hand.
  • the means 5 hereby consist of a light source 9, preferably a laser which emits the light 6 in the shape of a ray of light, namely a laser beam 10, as well as means to systematically turn the laser beam 10 over an angle A which are not represented here, such that the product stream is scanned over the width B, in particular on the place of the line part L.
  • a light source 9 preferably a laser which emits the light 6 in the shape of a ray of light, namely a laser beam 10
  • the means 8 consist of an optical filter 11 on the one hand which mainly exclusively lets the light 7 through from the spectrum range in which the emission takes place, and of a detection device 12 to observe said light 7 on the other hand.
  • figure 1 schematically represents means 13, such as an electronic processing unit, to make a selection between the scanned products 1-2 as a function of the observed light 7, also as a function of the place on the line part L where said light 7 came from.
  • means 14 are provided which in this case consist of nozzles 15 which can be individually activated and which are controlled by means of a valve unit 16 which is not further described here, as a function of the signals 17 coming from the above-mentioned processing unit.
  • the means 14 also comprise a partition 18.
  • FIG. 1 Another element 20 is represented in figure 1 having a surface 21 which forms an emitting background. As explained in the introduction, it preferably consists of a cylindrical roller.
  • the method according to the invention consists in that light 6 is cast having at least such a wavelength that one of either products 1-2, when it is irradiated by the light 6, spontaneously starts to cast or emit light at another wavelength than that of the light 6 with which it is irradiated.
  • the parts 23 are the result of the emission at the surface 21.
  • the parts 24 indicate that products 2 are present which cause no emission.
  • an automatic selection is carried out to detect the places where the products 2 pass, on the basis of the above- mentioned signal progress. As explained in the introduction, this is preferably done on the basis of a certain value of the above-mentioned signal being either or not exceeded, in particular by checking when the signal goes beneath a certain limit value W in the case of figure
  • one or several nozzles 15 are activated, on the place where the product 2 is found, so that each such product 2 is blown out of the product stream 4, in particular behind the partition 18. As they are blown away, it may happen that a number of products 1 are also removed from the product stream 4, but since the quantity of products 2 usually is very small in relation to the quantity of products 1, also the good products 1 which are blown out of the product stream 4 will be limited in number.
  • Figures 3 to 6 hereafter represent a possible practical construction of a device 25 for realising the above- mentioned method in further detail .
  • FIG 3 shows the device 25 as a whole.
  • This device 25 is equipped with two optical units 26 and 27 which, as is schematically represented in figures 4 and 5, make it possible for the products 1-2 to be scanned on either side.
  • Every unit 26, 27 respectively has a construction as is schematically represented in figure 1, as well as in figure 6 which will be described hereafter.
  • a device 25 is equipped with means 28 in the shape of a vibrating table 29, from where the products 1-2 are vibrated downward over the edge 30 of this vibrating table 29. Via a sliding surface 31 they are guided into a zone 32, where they fall down freely and where they are also scanned, as mentioned above .
  • Figure 6 further schematically represents how the cast light 6 and the emitted light 7 which is caught again by means of a moving mirror 35, in particular a rotating polygon mirror, can be moved over the width B of the product stream 4.
  • Figure 7 represents a part of a special embodiment of a device 25 according to the invention.
  • the means for conveying the products 1-2 to be sorted in the shape of a product stream 4 over a certain path hereby mainly consist of a drum 36 which is provided with inlets 37 on its surface against which the products 1-2 are sucked, by creating a vacuum in an appropriate manner.
  • the means for automatically making a separation as a function of the selection in this case consist of means which are not represented, in particular valves or such, which make it possible to selectively control the inlets 37 concerned, in particular to close or to open them.
  • the product stream 4 is for example brought into contact with the surface of the drum 36 via a feed chute 38. Thanks to the suction force on the inlets 37, products 1-2 are sucked onto the surface of the drum 36, as a result of which the product stream 4 so to say continues on the surface of this drum 36.
  • the surface of the drum 36 may hereby either or not consist of a light-emitting material, with the same purpose as the surface 21 of the above-mentioned element 20.
  • the width B is in reality a considerable number of times the diameter of the product 1-2. In reality, this width will usually be in the order of magnitude of 0.3 to 1 meter, but of course it can also deviate therefrom. Further, the product stream 4 in reality consists of a quantity of products 1-2 spread out over almost the entire surface of the path 3.

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  • Sorting Of Articles (AREA)
EP00940074.8A 1999-06-28 2000-06-21 Verfahren und vorrichtung zum sortieren von produkten Expired - Lifetime EP1189709B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9900446 1999-06-28
BE9900446A BE1013056A3 (nl) 1999-06-28 1999-06-28 Werkwijze en inrichting voor het sorteren van producten.
PCT/BE2000/000068 WO2001000333A1 (en) 1999-06-28 2000-06-21 Method and device for sorting products

Publications (2)

Publication Number Publication Date
EP1189709A1 true EP1189709A1 (de) 2002-03-27
EP1189709B1 EP1189709B1 (de) 2015-12-02

Family

ID=3891976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00940074.8A Expired - Lifetime EP1189709B1 (de) 1999-06-28 2000-06-21 Verfahren und vorrichtung zum sortieren von produkten

Country Status (8)

Country Link
US (1) US6734383B1 (de)
EP (1) EP1189709B1 (de)
AU (1) AU5515800A (de)
BE (1) BE1013056A3 (de)
CA (1) CA2376975C (de)
DK (1) DK1189709T3 (de)
ES (1) ES2564159T3 (de)
WO (1) WO2001000333A1 (de)

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EP2671651B1 (de) 2012-06-07 2015-04-29 Visys NV Vorrichtung und Verfahren zur Prüfung und Sortierung eines Produktstroms
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Also Published As

Publication number Publication date
AU5515800A (en) 2001-01-31
BE1013056A3 (nl) 2001-08-07
CA2376975C (en) 2008-08-19
CA2376975A1 (en) 2001-01-04
US6734383B1 (en) 2004-05-11
ES2564159T3 (es) 2016-03-18
DK1189709T3 (en) 2016-03-07
WO2001000333A1 (en) 2001-01-04
EP1189709B1 (de) 2015-12-02

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